He Yuheng, Bai Ling, Liu Baocang, Duan Hongwei, Zhang Jun
School of Chemistry and Chemical Engineering, Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules, Inner Mongolia University, 49 Xilinguole South Road, Hohhot 010020, China.
School of Materials Science and Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China.
Nanomaterials (Basel). 2023 Oct 9;13(19):2733. doi: 10.3390/nano13192733.
Colloidal assembly of anisotropic particles holds great promise for achieving diverse packing geometries and unique photonic properties. One intriguing candidate for anisotropic self-assembly is colloidal metal-organic frameworks (MOFs), which possess remarkable characteristics including substantial surface areas, tunable chemical properties, a wide range of structural variations, and diverse polyhedral shapes. In this study, the colloidal assembly of nearly spherical and polyhedral MOFs particles to form quasi-ordered photonic superstructures was investigated. Specifically, monodisperse near-spherical ZIF-8 (NSZIF-8) and rhombic dodecahedron ZIF-8 (RDZIF-8) colloidal nanoparticles were synthesized as the fundamental building blocks. These nanoparticles are employed to construct MOFs-based self-assembled superstructures that exhibit thin-film interference optical properties. Importantly, these superstructures demonstrate exceptional responsiveness to gaseous homologues and isomers with approximate refractive indices. The dynamic reflection spectral patterns exhibited by these superstructures provide valuable insights into the diffusion rates and surface tension characteristics of the target solvents. These findings underscore the potential of MOFs-based superstructure thin films to discriminate between physiochemically similar solvents, opening new avenues for applications in various fields.
各向异性颗粒的胶体组装在实现多种堆积几何结构和独特光子特性方面具有巨大潜力。胶体金属有机框架（MOF）是各向异性自组装的一个有趣候选物，它具有显著特性，包括大表面积、可调节的化学性质、广泛的结构变化以及多样的多面体形状。在本研究中，研究了近球形和多面体MOF颗粒的胶体组装以形成准有序光子超结构。具体而言，合成了单分散近球形ZIF-8（NSZIF-8）和菱形十二面体ZIF-8（RDZIF-8）胶体纳米颗粒作为基本构建单元。这些纳米颗粒被用于构建基于MOF的自组装超结构，该超结构展现出薄膜干涉光学性质。重要的是，这些超结构对具有近似折射率的气态同系物和异构体表现出非凡的响应性。这些超结构呈现的动态反射光谱模式为目标溶剂的扩散速率和表面张力特性提供了有价值的见解。这些发现强调了基于MOF的超结构薄膜在区分物理化学性质相似的溶剂方面的潜力，为各个领域的应用开辟了新途径。
